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		<title>伪类选择器</title>
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		<a href="https://blog.csdn.net/weixin_30607029/article/details/95110091">样式规则声明</a>
		<a href="https://www.w3school.com.cn/css/css_selector_type.asp">HTML选择器</a>
		<a href="https://www.w3school.com.cn/css/css_selector_class.asp">类选择器</a>
		<a href="https://www.w3school.com.cn/css/css_syntax_id_selector.asp">ID选择器</a>
		
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